Fuel cell



FIG. 1 is a top plan view of a fuel cell;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevation thereof, the left side being a mirror image of that shown;

FIG. 6 is a perspective view of a fuel cell, showing my new design, the broken lines showing the fittings secured to my new design is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for fuel cell, as shown and described. 